Interview Questions C++ - Standard Mathematical Functions

This section on C++ interview questions and answers focuses on “Standard Mathematical Functions”. One shall practice these interview questions to improve their C++ programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C++ programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C++ interview questions come with detailed explanation of the answers which helps in better understanding of C++ concepts.

Here is a listing of C++ interview questions on “Standard Mathematical Functions” along with answers, explanations and/or solutions:

1. With which does the trigonometric functions work with angles in c++?
a) Degrees
b) Radians
c) Both Degrees & Radians
d) Celsius
View Answer

Answer: b
Explanation: The trigonometric functions work with angles in radians rather than degrees.

2. Which header file is required for manipulation of math functions in c++?
a) cmath
b) maths
c) math
d) dmath
View Answer

Answer: a
Explanation: #include is a header file required for manipulation of math functions.

3. How many macros are used by mathematical functions in the header file <cerrno>?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: c
Explanation: There are three macros used in mathematical functions. They are HUGE_VAL, EDOM, ERANGE.

4. What will be the output of the following C++ code?

```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main ()
```
```
    {
```
```
        int param, result;
```
```
        int n;
```
```
        param = 8.0;
```
```
        result = frexp (param , &n);
```
```
        printf ("%d \n", param);
```
```
        return 0;
```
```
    }
```

a) 6
b) 7
c) 8
d) 9
View Answer

Answer: c
Explanation: In this program, We are breaking out the number by using the frexp function.
Output:

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$ g++ math.cpp
$ a.out
8

5. What will be the output of the following C++ code?

```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main ()
```
```
    {
```
```
        double param, result;
```
```
        param = 5.5;
```
```
        result = log (param);
```
```
        printf ("%lf", result );
```
```
        return 0;
```
```
    }
```

a) 5.5
b) 3.14
c) 1.704
d) 2.4656
View Answer

Answer: c
Explanation: In this program, We are finding out the log value of param by using param function.
Output:

$ g++ math1.cpp
$ a.out
1.704748

6. What will be the output of the following C++ code?

```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main ()
```
```
    {
```
```
        printf ("%lf", pow (7.0,3));
```
```
        return 0;
```
```
    }
```

a) 343
b) 343.00
c) 334
d) 324
View Answer

Answer: b
Explanation: In this program, We are calculating the 7 power of 3 by using the powfunction. As we are using 7.0, it is producing the result in 343.00
Output:

$ g++ math2.cpp
$ a.out
343.000000

7. What will be the output of the following C++ code?

```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main ()
```
```
    {
```

        printf ("%lf\n", fmod (5.3, 2) );

        printf ("%lf\n", fmod (18.5, 4.2) );

```
        return 0;
```
```
    }
```

a) 1.300
b) 1.700
c)

1.300
1.700

d) 1.65
View Answer

Answer: c
Explanation: In this program, We are finding the remainder of the given values by using fmod function.
Output:

$ g++ math3.cpp
$ a.out
1.300000
1.700000

8. What will be the output of the following C++ code?

```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main ()
```
```
    {
```
```
        printf ("%lf", fabs (-10.6) );
```
```
        return 0;
```
```
    }
```

a) 10
b) -10
c) 10.600000
d) -25
View Answer

Answer: c
Explanation: In this program, We are finding the absolute value of -10.6 by using abs function.
Output:

$ g++ math4.cpp
$ a.out
10.600000

9. Which of the following mathematical function is overloaded in <complex> and <valarray>?
a) cos
b) tan
c) sin
d) mod
View Answer

Answer: b
Explanation: Because tan has more different definition in normal case and in case of complex number i.e. tan = sin/cos(normally) and tan = y/x in complex numbers.

10. How many parameters are used in frexp function?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: b
Explanation: There are two parameters that are used in frexp function. They are floating point value to be computed and pointer to an int object.

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